WebId-TLS can‘t work when behind Nginx

[EurekaChen]

I built a WebId（https://eureka.name/profile/card#me ) using the Solid Server and Nginx as reverse proxy（ref solution 4：https://github.com/solid/node-solid-server/wiki/Running-Solid-behind-a-reverse-proxy）, but if I Log in with Certificate（WebId-TLS）, I always get a response of "504 Gateway Time-out" from Nginx. I guess the SSL certificate cannot reach the Solid Server or something else wrong, how to set Nginx, or should I modify some settings in config.json to run solid server, or solid server just have this issue?